PEIR Digital Library

Welcome to the Pathology Education Informational Resource (PEIR) Digital Library, a multidisciplinary public access image database for use in medical education.

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DIAGRAM: BONE: DIAGRAM OF A FETUS SHOWING BONES THAT UNDERGO ENDOCHONDRAL OSSIFICATION; Endochondral ossification, the replacement of a cartilaginous template by bone, is the mechanism used to form most of the bones in the body, including the base of the skull, the vertebral column, the pelvis, and the extremities.